Crack 1.1 OTL Headphone Amplifier Kit


We have just a few Crack kits in stock, ready to ship. Order early and they can ship the same day (5/30/19 – we are moving into temporary summer quarters while we wait for our new office to be ready and it may take and extra day or two to ship your kit). You can learn more about the Speedball upgrade for this kit at this link.



This product has a universal power transformer and can be used worldwide by following the wiring instructions in the manual. Please note that international customers will need to provide their own power cord.

SKU: CRAC Category:

This is what we call a Skill Level 1 kit, perfect for first time builders. The circuit is so simple you can build it in an evening or two. A simple circuit also means a low parts count, which keeps the price low, too. Crack is an output transformerless amp designed for higher impedance headphones like the Sennheiser, AKG and Beyer designs. The Crack has now become the Crack 1.1. The new manual has almost twice the number of pictures and was re-written from the ground up to help steer builders away from the common pitfalls we’ve seen over the years. And the new version has a universal transformer for all the international Crackateers! See the ‘more’ tab below for in-depth info. You also might want to check out the Speedball Upgrade for this amp.

DISCOUNTS: When you buy 1 > Regular Price: $315.00USD • When you buy 2-9 > Sale Price: $283.50USD • Save: $31.50USD (10%)! • When you buy 10 or more > Sale Price: $267.75USD • Save: $47.25USD (15%)!

Your pre-order will be charged the day the kit is ordered. We do this to allow cash in advance payment to our vendors to keep the price you pay as low as possible. DIY audio is a very focused esoteric market. We are a small staff with a large passion, attempting to offer the broadest range of kits possible to those interested in this exclusive pursuit of ultra high quality audio reproduction, Thus each kit is manufactured and packed to order, and the production and packaging schedule is influenced by demand. Please understand that our shipment can take up to 3 to 6 weeks when demand is high. You may check how shipping is progressing for a kit by looking here.

Additional information

Weight 7.1 lbs
Dimensions 12 x 10 x 6 in
Upgrade Options

Add the Speedball, Basic Crack


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S.E.X. kit on sale through July 21st. We have moved! Check the Contact page. Dismiss